You observe a moon around another planet

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You observe a moon around another planet. You can only measure two properties about the moon; namely, the radius of its orbit and how long it takes for it to make one orbit.

Suppose the moon you observe takes 172 hours to orbit its planet once, and you measure its orbital radius to be 1 million kilometers. What is the mass M of the PLANET?

This is going to be a very large number, so instead of entering M as the solution, calculate

x= M/10²⁸.